Yes, it was military issue for some odd close to a hundred years now. "TL" stands for Tool, Linesman, they were made by many companies, and there are a fair amount of threads related to them here. I'm sure someone can share a link.
i was to late to enter the POS trade. but QCUT kindly gave me one of his.the little camillus 64 punch stock man. it came on my birthday. i spent a pleasant afternoon . cleaning, reglueing bone covers,reshapeing broken blades.and sharpening.now it shares watch pocket time. with the old case xx i got from PALADIN. here are the before and after pic,s thanks for looking.